Synergistically acting herbicidal mixtures

ABSTRACT

A synergistic herbicidal mixture comprising 
 
A) at least one 3-heterocyclyl-substituted benzoyl derivative of the formula I  
                 
in which the variables have the following meanings: 
             R 1 , R 3  are halogen, alkyl, haloalkyl, alkoxy, haloalkoxy, alkylthio, alkylsulfinyl or alkylsulfonyl;    R 2  is a optionally substituted heterocyclic radical selected from the group: isoxazol-3-yl, isoxazol-4-yl, isoxazol-5-yl, 4,5-dihydroisoxazol-3-yl, 4,5-dihydroisoxazol-4-yl and 4,5-dihydroisoxazol-5-yl;    R 4  is hydrogen, halogen or alkyl;    R 5  is alkyl;    R 6  is hydrogen or alkyl; or one of its environmentally compatible salts; and 
 
B) at least the compound of formula IIa  
                 
or one of its environmentally compatible salts; or 
 
the compound of formula IIb  
                 
or one of its environmentally compatible salts; and, if desired, C) at least one further herbicidal compound; in a synergistically effective amount. Compositions comprising these mixtures, processes for the preparation of these compositions, and their use for controlling undesired plants.

The present invention relates to a synergistic herbicidal mixture comprising

-   -   A) at least one 3-heterocyclyl-substituted benzoyl derivative of         the formula I     -   in which the variables have the following meanings:         -   R¹, R³ are halogen, C₁-C₆-alkyl, C₁-C₆-haloalkyl,             C₁-C₆-alkoxy, C₁-C₆-haloalkoxy, C₁-C₆-alkylthio,             C₁-C₆-alkylsulfinyl or C₁-C₆-alkylsulfonyl;         -   R² is a heterocyclic radical selected from the group:             isoxazol-3-yl, isoxazol-4-yl, isoxazol-5-yl,             4,5-dihydroisoxazol-3-yl, 4,5-dihydroisoxazol-4-yl and             4,5-dihydroisoxazol-5-yl, it being possible for the six             radicals mentioned to be unsubstituted or mono- or             polysubstituted by halogen, C₁-C₄-alkyl, C₁-C₄-alkoxy,             C₁-C₄-haloalkyl, C₁-C₄-haloalkoxy or C₁-C₄-alkylthio;         -   R⁴ is hydrogen, halogen or C₁-C₆-alkyl;         -   R⁵ is C₁-C₆-alkyl;         -   R⁶ is hydrogen or C₁-C₆-alkyl;         -   or one of its environmentally compatible salts; and     -   B) at least the compound of formula IIa     -   or one of its environmentally compatible salts; or     -   the compound of formula IIb     -   or one of its environmentally compatible salts;         and, if desired,     -   C) at least one herbicidal compound from the group of the         acetyl-CoA carboxylase inhibitors (ACC), acetolactate synthase         inhibitors (ALS), amides, auxin-herbicides, auxin transport         inhibitors, carotenoid biosynthesis inhibitors,         enolpyruvyl-shikimate 3-phosphate synthase inhibitors (EPSPS),         glutamine synthetase inhibitors, lipid biosynthesis inhibitors,         mitosis inhibitors, protoporphyrinogen IX oxidase inhibitors,         photosynthesis inhibitors, synergists, growth substances, cell         wall biosynthesis inhibitors and a variety of other herbicides;     -   in a synergistically effective amount.

The invention furthermore relates to herbicidal compositions comprising a herbicidally active amount of a synergistic herbicidal mixture as defined above and at least one liquid and/or solid carrier and, if desired, at least one surfactant.

Moreover, the invention relates to processes for the preparation of these compositions and to a method of controlling undesirable vegetation.

In crop protection products, it is always desirable to increase the specific activity of an active ingredient and the reliability of action. It is an object of the present invention to increase the activity and/or selectivity of the herbicidally active 3-heterocyclyl-substituted benzoyl derivatives of the formula I against undesirable harmful plants.

We have found that this object is achieved by the mixtures defined at the outset. We have furthermore found herbicidal compositions which comprise these mixtures, processes for their preparation, and methods of controlling undesirable vegetation. In the last-mentioned cases, it is irrelevant whether the herbicidally active compounds of the components A), B) and, if desired, C) are formulated and applied jointly or separately and in which sequence they are applied in the case of separate application.

The mixtures according to the invention show a synergistic effect; the compatibility of the herbicidally active compounds of components A), B) and, if desired C) for certain crop plants is generally retained.

Suitable components C are, as acetyl-CoA carboxylase inhibitors (ACC), for example, cyclohexenone oxime ethers, phenoxyphenoxy-propionic esters or arylaminopropionic acids. The acetolactate synthase inhibitors (ALS) include, inter alia, imidazolinones, pyrimidyl ethers, sulfonamides or sulfonyl ureas. Relevant auxin herbicides are, inter alia, pyridine carboxylic acids, 2,4-D or benazolin. Lipid biosynthesis inhibitors which are used are, inter alia, anilides, chloroacetanilides, thioureas, benfuresate or perfluidone. Suitable mitosis inhibitors are, inter alia, carbamates, dinitroanilines, pyridines, butamifos, chlorthal-dimethyl (DCPA) or maleic hydrazide. Examples of protoporphyrinogen IX oxidase inhibitors are, inter alia, diphenyl ethers, oxadiazoles, cyclic imides or pyrazoles. Suitable photosynthesis inhibitors are, inter alia, propanil, pyridate, pyridafol, benzothiadiazinones, dinitrophenols, dipyridylenes, ureas, phenols, chloridazon, triazine, triazinone, uracils or biscarbamates. The synergists are, inter alia, oxiranes. Examples of suitable growth substances are aryloxyalkanoic acids, benzoic acids or quinolinecarboxylic acids. The group “various other herbicide” is to be understood as meaning, inter alia, the classes of the active ingredients dicloropropionic acids, dihydrobenzofurans, phenylacetic acids and individual herbicides mentioned below whose mechanism of action is not (fully) understood.

Other suitable components C are active compounds selected from the group of the amides, auxin transport inhibitors, carotenoic biosynthesis inhibitors, enolpyruvylshikimate 3-phosphate synthase inhibitors (EPSPS), glutamine synthetase inhibitors and cell wall synthesis inhibitors.

Examples of herbicides which can be used in combination with the 3-heterocyclyl-substituted benzoyl derivatives of formula I and the compound of formula IIa and/or the compound of formula IIb according to the present invention are, inter alia:

-   -   C1 acetyl-CoA carboxylase inhibitors (ACC), for example         -   cyclohexenone oxime ethers, such as alloxydim, clethodim,             cloproxydim, cycloxydim, sethoxydim, tralkoxydim,             butroxydim, clefoxydim or tepraloxydim;         -   phenoxyphenoxypropionic esters, such as clodinafoppropargyl             (and, if appropriate, cloquintocet), cyhalofop-butyl,             diclofop-methyl, fenoxaprop-ethyl, fenoxaprop-P-ethyl,             fenthiapropethyl, fluazifop-butyl, fluazifop-P-butyl,             haloxyfop-ethoxyethyl, haloxyfopmethyl, haloxyfop-P-methyl,             isoxapyrifop, propaquizafop, quizalofop-ethyl,             quizalofop-P-ethyl or quizalofop-tefuryl; or         -   arylaminopropionic acids, such as flamprop-methyl or             flamprop-isopropyl;     -   C2 acetolactate synthase inhibitors (ALS), for example         -   imidazolinones, such as imazapyr, imazaquin,             imazamethabenz-methyl (imazame), imazamox, imazapic,             imazethapyr or imazamethapyr;         -   pyrimidyl ethers, such as pyrithiobac-acid,             pyrithiobac-sodium, bispyribac-sodium, KIH-6127 or             pyribenzoxym;         -   sulfonamides, such as florasulam, flumetsulam or metosulam;             or         -   sulfonylureas, such as amidosulfuron, azimsulfuron,             bensulfuron-methyl, chlorimuron-ethyl, chlorsulfuron,             cinosulfuron, cyclosulfamuron, ethametsulfuron-methyl,             ethoxysulfuron, flazasulfuron, halosulfuron-methyl,             imazosulfuron, metsulfuron-methyl, nicosulfuron,             primisulfuron-methyl, prosulfuron, pyrazosulfuron-ethyl,             rimsulfuron, sulfometuron-methyl, thifensulfuron-methyl,             triasulfuron, tribenuron-methyl, triflusulfuron-methyl,             N-[[[4-methoxy-6-(trifluoromethyl)-1,3,5-triazin-2-yl]amino)carbonyl]-2-(trifluoromethyl)-benzenesulfon-amide,             sulfosulfuron or iodosulfuron;     -   C3 amides, for example         -   allidochlor (CDAA), benzoylprop-ethyl, bromobutide,             chlorthiamid, diphenamid, etobenzanid (benzchlomet),             fluthiamide, fosamin or monalide;     -   C4 auxin herbicides, for example         -   pyridinecarboxylic acids, such as clopyralid or picloram; or         -   2,4-D or benazolin;     -   C5 auxin transport inhibitors, for example         -   naptalame or diflufenzopyr;     -   C6 carotenoid biosynthesis inhibitors, for example         -   benzofenap, clomazone (dimethazone), diflufenican,             fluorochloridone, fluridone, pyrazolynate, pyrazoxyfen,             isoxaflutole, isoxachlortole, mesotrione, sulcotrione             (chlormesulone), ketospiradox, flurtamone, norflurazon or             amitrol;     -   C7 enolpyruvylshikimate-3-phosphate synthase inhibitors (EPSPS),         for example         -   glyphosate or sulfosate;     -   C8 glutamine synthetase inhibitors, for example         -   bilanafos (bialaphos) or glufosinate-ammonium;     -   C9 lipid biosynthesis inhibitors, for example         -   anilides, such as anilofos or mefenacet;         -   chloroacetanilides, such as dimethenamid, S-dimethenamid,             acetochlor, alachlor, butachlor, butenachlor,             diethatyl-ethyl, dimethachlor, metazachlor, metolachlor,             S-metolachlor, pretilachlor, propachlor, prynachlor,             terbuchlor, thenylchlor or xylachlor;         -   thioureas, such as butylate, cycloate, di-allate,             dimepiperate, EPTC, esprocarb, molinate, pebulate,             prosulfocarb, thiobencarb (benthiocarb), tri-allate or             vernolate; or         -   benfuresate or perfluidone;     -   C10 mitosis inhibitors, for example         -   carbamates, such as asulam, carbetamid, chlorpropham,             orbencarb, pronamid (propyzamid), propham or tiocarbazil;         -   dinitroanilines, such as benefin, butralin, dinitramin,             ethalfluralin, fluchloralin, oryzalin, pendimethalin,             prodiamine or trifluralin;         -   pyridines, such as dithiopyr or thiazopyr; or         -   butamifos, chlorthal-dimethyl (DCPA) or maleic hydrazide;     -   C11 protoporphyrinogen IX oxidase inhibitors, for example         -   diphenyl ethers, such as acifluorfen, acifluorfensodium,             aclonifen, bifenox, chlornitrofen (CNP), ethoxyfen,             fluorodifen, fluoroglycofen-ethyl, fomesafen, furyloxyfen,             lactofen, nitrofen, nitrofluorfen or oxyfluorfen;         -   oxadiazoles, such as oxadiargyl or oxadiazon;         -   cyclic imides, such as azafenidin, butafenacil,             carfentrazone-ethyl, cinidon-ethyl, flumiclorac-pentyl,             flumioxazin, flumipropyn, flupropacil, fluthiacet-methyl,             sulfentrazone or thidiazimin; or         -   pyrazoles, such as ET-751, JV 485 or nipyraclofen;     -   C12 photosynthesis inhibitors, for example         -   propanil, pyridate or pyridafol;         -   benzothiadiazinones, such as bentazone;         -   dinitrophenols, for example bromofenoxim, dinoseb,             dinoseb-acetate, dinoterb or DNOC;         -   dipyridylenes, such as cyperquat-chloride,             difenzoquat-methylsulfate, diquat or paraquat-dichloride;         -   ureas, such as chlorbromuron, chlorotoluron, difenoxuron,             dimefuron, diuron, ethidimuron, fenuron, fluometuron,             isoproturon, isouron, linuron, methabenzthiazuron,             methazole, metobenzuron, metoxuron, monolinuron, neburon,             siduron or tebuthiuron;         -   phenols, such as bromoxynil or ioxynil;         -   chloridazon;         -   triazines, such as ametryn, atrazine, cyanazine, desmetryn,             dimethamethryn, hexazinone, prometon, prometryn, propazine,             simazine, simetryn, terbumeton, terbutryn, terbutylazine or             trietazine;         -   triazinones, such as metamitron or metribuzin;         -   uracils, such as bromacil, lenacil or terbacil; or         -   biscarbamates, such as desmedipham or phenmedipham;     -   C13 synergists, for example         -   oxiranes, such as tridiphane;     -   C14 growth substances, for example         -   aryloxyalkanoic acids, such as 2,4-DB, clomeprop,             dichlorprop, dichlorprop-P (2,4-DP-P), fluoroxypyr, MCPA,             MCPB, mecoprop, mecoprop-P or triclopyr;         -   benzoic acids, such as chloramben or dicamba; or         -   quinolinecarboxylic acids, such as quinclorac or quinmerac;     -   C15 cell wall synthesis inhibitors, for example         -   isoxaben or dichlobenil;     -   C16 various other herbicides, for example         -   dichloropropionic acids, such as dalapon;         -   dihydrobenzofurans, such as ethofumesate;         -   phenylacetic acids, such as chlorfenac (fenac); or         -   aziprotryn, barban, bensulide, benzthiazuron, benzofluor,             buminafos, buthidazole, buturon, cafenstrole, chlorbufam,             chlorfenprop-methyl, chloroxuron, cinmethylin, cumyluron,             cycluron, cyprazine, cyprazole, dibenzyluron, dipropetryn,             dymron, eglinazin-ethyl, endothall, ethiozin, flucabazone,             fluorbentranil, flupoxam, isocarbamid, isopropalin,             karbutilate, mefluidide, monuron, napropamide,             napropanilide, nitralin, oxaciclomefone, phenisopham,             piperophos, procyazine, profluralin, pyributicarb,             secbumeton, sulfallate (CDEC), terbucarb, triaziflam,             triazofenamid or trimeturon;             or their environmentally compatible salts.

The 3-heterocyclyl-substituted benzoyl derivatives of the formula I are disclosed in WO 96/26206, WO 97/41116, WO 97/41117, WO 97/41118 and WO 98/31681.

The compound of formula IIa (common name flumetsulam) and the compound of formula IIb (common name clopyralid) as well as the herbicidally active compounds from amongst groups C1 to C16 are described, for example, in

-   -   “Herbizide [Herbicides]”n, Hock, Fedtke, Schmidt, 1^(st)         edition, Thieme 1995 (s. “quinclorac” p. 238, “molinat” p. 32,         “butachlor” p. 32, “pretilachlor” p. 32, “dithiopyr” p. 32,         “mefenacet” p. 32, “fenoxapropethyl” p. 216, “dimepiperate” p.         32, “pyrazolynate” p. 146, “pyrazoxyfen” p. 146,         “bensulfuronmethyl” p. 31, “pyrazosulfuron-ethyl” p. 31,         “cinosulfuron” p. 31, “benfuresate” p. 233, “bromobutide” p.         243, “dymron” p. 243, “dimethyametryn” p. 118, “esprocarb” p.         229, “pyributicarb” p. 32, “cinemthylin” p. 32, “propanil” p.         32, “2,4-D” p. 30, “bentazon” p. 30, “azimsulfuron         (DPX-A-8947)” p. 175, “mecoprop-P” p. 237, “chlorpropham” p.         205, “ethoxyfen” p. 30, “haloxyfop-P-methyl” p. 38,         “haloxyfopethoxyethyl” p. 38, “flumiclorac-pentyl” p. 35,         “flupropacil” p. 143, “nipyraclofen” p. 145, “metosulam” p. 33,         “e-thametsulfuron-methyl” p. 36, “thifensulfuron-methyl” p. 35,         “pyrithiobac acid” p. 181);     -   “Agricultural Chemicals”, Book II Herbicides, 1993 (s.         “thiobencarb” p. 85, “benzofenap” p. 221, “napropanilid” p. 49,         “piperophos” p. 102, “anilofos” p. 241, “imazosulfuron         (TH-913)” p. 150, “etobenzamid (HW-52)” p. 54, “sulcotrione         (ICIA-0051)” p. 268, “poast” p. 253, “focus” p. 222,         “di-methenamid” p. 48, “sulfosate” p. 236, “2,4-DB” p. 10,         “dichlorprop-P” p. 6, “flupoxam” p. 44, “prosulfocarb” p. 84,         “quinmerac” p. 233, “metazachlor” p. 64, “flurtamone” p. 265,         “bromofenoxim” p. 228, “fomesafen” p. 248,         “imazamethabenz-methyl” p. 153, “clodinafop-propargyl” p. 214,         “feno-xaprop-P-ethyl” p. 208, “fluazifop-P-butyl” p. 207,         “quizalofop-P-ethyl” p. 210, “quizalofop-terfuryl” p. 211,         “flumioxazin” p. 43, “flumipropyn” p. 267, “sulfentrazone” p.         261, “thiazopyr” p. 226, “pyrithiobac-sodium” p. 266,         “flumetsulam” p. 227, “amidosulfuron” p. 151,         “halosulfuron-methyl” p. 148, “rimsulfuron” p. 138,         “tribenuron-methyl” p. 139, “triflusulfuron-methyl” p. 137,         “primisulfuron-methyl” p. 147);     -   “Agricultural Chemicals”, Book II Herbicides, 13^(th) Edition         (s. “carfenstole” p. 284, “sulfosulfuron” p. 145,         “ethoxysulfuron” p. 149, “pyribenzoxym” p. 279,         “diflufenzopyr” p. 90, “ET-751” p. 278, “carfentrazone-ethyl” p.         267, “fluthiacet-methyl” p. 277, “imazapic” p. 160,         “butenachlor” p. 54, “tiocarbazil” p. 84, “fluthiamide” p. 62,         “isoxaflutole” p. 283, “butroxydim” p. 259,)     -   “Short Review of Herbicides & PGRs 1991, Hodogaya Chemicals (s.         “furyloxyfen” p. 142, “triazofenamid” p. 268, “thenylchlorid         (NSK-850)” p. 52, “cumyluron (JC-940)” p. 90, “pendimethalin         (AC-92553)” p. 58, “buthidazole” p. 88, “cyprazole” p. 38,         “allidochlor” p. 48, “benzoylprop-ethyl” p. 38,         “chlorthiamid” p. 150, “diphenamid” p. 34, “flampropmethyl” p.         40, “fosamin” p. 232, “isoxaben” p. 42, “monalide” p. 32,         “naptalam” p. 36, “pronamid” p. 34, “bialaphos” p. 234,         “glufosinate-ammonium” p. 234, “glyphosate” p. 232, “amitrol”         p.,254, “clomeprop p. 20, “dichlorprop” p. 6, “fenoprop” p. 8,         “fluroxypyr” p. 156, “MCPA” p. 4, “MCPB” p. 8, “mecoprop” p. 6,         “napropamide” p. 16, “triclopyr” p. 154, “chloramben” p. 28,         “dicamba” p. 26, “clomazone” p. 268, “diflufenican” p. 42,         “fluorochloridone” p. 266, “fluridone” p. 156, “asulam” p. 112,         “barban” p. 100, “butylate” p. 106, “carbetamide” p. 36,         “chlorobufam” p. 100, “cycloate” p. 108, “desmedipham” p. 104,         “di-allate” p. 106, “EPTC” p. 108, “orbencarb” p. 112,         “pebulate” p. 106, “phenisopham” p. 118, “phenmedipham” p. 104,         “propham” p. 100, “sulfallate” p. 110, “terbucarb” p. 102,         “tri-allate” p. 108, “vernolate” p. 108, “acetochlor” p. 48,         “alachlor” p. 46, “diethathyl-ethyl” p.48, “dimethachlor” p. 50,         “metolachlor” p. 46, “propachlor” p. 44, “pyrnachlor” p. 44,         “terbuchlor” p. 48, “xylachlor” p. 52, “alloxydim” p. 260,         “clethodim” p. 270, “cloproxydim” p. 268, “tralkoxydim” p. 270,         “dalapon” p. 212, “lethofumesate” p. 124, “benefin” p. 54,         “butralin” p. 58, “dinitramin” p. 56, “lethalfluralin” p. 60,         “fluchloralin” p. 54, “isopropalin” p. 58, “nitralin” p. 58,         “oryzalin” p. 60, “prodiamine” p. 62, “profluralin” p. 54,         “trifluralin” p. 54, “dinoseb” p. 128, “dinoseb-acetate” p. 128,         “dinoterb” p. 128, “DNOC” p. 126, “acifluorfensodium” p. 142,         “aclonifen” p. 146, “bifenox” p. 140, “chlornitrofen” p. 138,         “difenoxuron” p. 76, “fluorodifen” p. 138,         “fluoroglycofen-ethyl” p. 146, “lactofen” p. 144, “nitrofen” p.         136, “nitrofluorfen” p. 140, “oxyfluorfen” p. 140,         “cyperquat-chloride” p. 158, “difenzoquat-methyl-sulfate” p.         160, “diquat” p. 158, “paraquat-dichloride” p. 158,         “benzthiazuron” p. 82, “buturon” p. 66, “chlorbromuron” p. 72,         “chloroxuron” p. 76, “chlorotoluron” p. 74, “cycluron” p. 84,         “dimefuron” p. 88, “diuron” p. 70, “ethidimuron” p. 86,         “fenuron” p. 64, “fluometuron” p. 68, “isoproturon” p. 80,         “isouron” p. 88, “karbutilate” p. 76, “linuron” p. 72,         “methabenzthiazuron” p. 82, “metoxuron” p. 72, “monolinuron” p.         66, “monuron” p. 64, “neburon” p. 72, “siduron” p. 68,         “tebuthiuron” p. 86, “trimeturon” p. 64, “isocarbamid” p. 168,         “imazamethapyr” p. 172, “imazapyr” p. 170, “imazaquin” p. 170,         “imazethapyr” p. 172, “methazole” p. 162, “oxadiazon” p. 162,         “tridiphane” p. 266, “bromoxynil” p. 148, “ioxynil” p. 148,         “diclofop-methyl” p. 16, “fenthiaprop-ethyl” p. 20,         “fluazifop-butyl” p. 18, “haloxyfop-methyl” p. 18,         “isoxapyrifop” p. 22, “propaquizafop” p. 24,         “quizalofop-ethyl” p. 20, “chlorfenac” p. 258,         “chlorfenprop-methyl” p. 258, “chloridazon” p. 174, “maleic         hydrazide” p. 162, “norflurazon” p. 174, “pyridate” p. 176,         “clopyralid” p. 154, “picloram” p. 154, “chlorimuron-ethyl” p.         92, “chlorsulfuron” p. 92, “flazasulfuron” p. 96,         “metsulfuron-methyl” S.92, “nicosulfuron” p. 96,         “sulfometuron-methyl” p. 92, “triasulfuron” p. 94, “ametryn” p.         198, “atrazine” p. 188, “aziprotryne” p. 206, “cyanazine” p.         192, “cyprazine” p. 192, “desmetryne” p. 200, “dipropetryn” p.         202, “eglinazine-ethyl” p. 208, “hexazinone” p. 208,         “procyazine” p. 192, “prometone” p. 196, “prometryn” p. 196,         “propazine” p. 188, “secbumeton” p. 196, “simazine” p. 188,         “simetryn” p. 196, “terbumeton” p. 204, “terbutryn” p. 198,         “terbutylazine” p. 190, “trietazine” p. 188, “ethiozine” p. 210,         “metamitron” p. 206, “metribuzin” p. 202, “bromacil” p. 180,         “lenacil” p. 180, “terbacil” p. 180, “benazolin” p. 262,         “bensulide” p. 228, “benzofluor” p. 266, “butamifos” p. 228,         “DCPA” p. 28, “dichlobenil” p. 148, “endothal” p. 264,         “mefluidide” p. 306, “perfluidone” p. 260, “terbuchlor” p. 48);     -   “Global Herbicide Directory” First Edition, 1994 (s.         “oxadiargyl” p. 96);     -   “European Directory of Agrochemical Products” Volume         2—Herbicides” Fourth Edition, (s. “buminafos” p. 255);     -   “The Pesticide Maunal, 12th edition, 2000 (s.         “bispyribacsodium” p. 97, “florasulam” p. 420,         “cyclosulfamuron” p. 217, “pretiachlor” p. 755).

Moreover, the compound “DEH-112” is disclosed in European Patent Application EP-A 302 203. The compound “tepraloxydim” is described in DE-A 33 36 140; the compound “cinidon-ethyl” in DE-A 36 03 789 and the compound “fluorbentranil” in EP-A 84 893. Other compounds are known from “Brighton Crop Protection Conference-Weeds—1993” (S. “thidiazimin” p. 29, “AC-322140” p. 41, “KIH-6127” p. 47, “prosulfuron” p. 53, “KIH-2023” p. 61, “metobenzuron” p. 67). The compound “carfenstrole (CH-900)” is mentioned in EP-A 332 133, and the compound N-[[[4-methoxy-6-(tri-fluoromethyl)-1,3,5-triazin-2-yl]amino]-carbonyl]-2-(trifluoro-methyl-benzenesulfonamide) is described in PCT/EP 96/03996.

The assignment of the active ingredients to the respective mechanisms of action is based on current knowledge. If several mechanisms of action apply to one active ingredient, this substance was only assigned to one mode of action.

The 3-heterocyclyl-substituted benzoyl derivatives of the formula I can exist, or be used, in the form of the pure enantiomers and also as racemates or diastereomer mixtures.

The 3-heterocyclyl-substituted benzoyl derivatives of the formula I and/or the compound of formula IIa and/or the compound of formula IIb and/or the herbicidally active compounds from amoungs groups C1 to C16 may also exist in the form of their environmentally compatible salts. Suitable salts are, in general, the salts of those cations, or the acid addition salts of those acids, whose cations, or anions, respectively, do not adversely affect the herbicidal action of the active ingredients.

Suitable cations are, in particular, ions of the alkali metals, preferably lithium, sodium and potassium, of the alkaline earth metals, preferably calcium and magnesium, and of the transition metals, preferably manganese, copper, zinc and iron, and also ammonium, it being possible in this case, if desired, for one to four hydrogen atoms to be replaced by C₁-C₄-alkyl, hydroxy-C₁-C₄-alkyl, C₁-C₄-alkoxy-C₁-C₄ -alkyl, hydroxy-C₁-C₄-alkoxy-C₁-C₄-alkyl, phenyl or benzyl, preferably ammonium, isopropylammonium, dimethylammonium, diisopropylammonium, tetramethylammonium, tetrabutylammonium, 2-(2-hydroxyeth-1-oxy)eth-1-yl ammonium, di(2-hydroxyeth-1-yl)ammonium, trimethylbenzylammonium, furthermore phosphonium ions, sulfonium ions, preferably tri(C₁-C₄-alkyl)-sulfonium and sulfoxonium ions, preferably, tri(C₁-C₄-alkyl)-sulfoxonium.

Anions of suitable acid addition salts are mainly chloride, bromide, fluoride, hydrogen sulfate, sulfate, dihydrogen phosphate, hydrogen phosphate, nitrate, hydrogen carbonate, carbonate, hexafluorosilicate, hexafluorophosphate, benzoate and the anions of C₁-C₄-alkanoic acids, preferably formate, acetate, propionate and butyrate.

Preferred with regard to the synergistic herbicidal action of the mixtures according to the invention are those 3-hetero-cyclyl-substituted benzoyl derivatives of the formula I in which the variables have the following meanings, either alone or in combination:

-   -   R¹ halogen such as chlorine or bromine, C₁-C₆-alkyl such as         methyl or ethyl or C₁-C₆-alkylsulfonyl such as methylsulfonyl or         ethylsulfonyl;         -   especially preferably chlorine, methyl or methylsulfonyl;     -   R² a heterocyclic radical selected from the group:         isoxazol-3-yl, isoxazol-5-yl and 4,5-dihydroisoxazol-3-yl, it         being possible for the three radicals mentioned to be         unsubstituted or mono- or polysubstituted by halogen,         C₁-C₄-alkyl, C₁-C₄-alkoxy, C₁-C₄-haloalkyl, C₁-C₄-haloalkoxy or         C₁-C₄-alkylthio;         -   especially preferably isoxazol-5-yl, 3-methyl-isoxazol-5-yl,             4,5-dihydroisoxazol-3-yl, 5-methyl-4,5-dihydroisoxazol-yl,             5-ethyl-4,5-dihydroisoxazol-3-yl or             4,5-dimethyl-4,5-di-hydroisoxazol-3-yl;     -   R³ halogen such as chlorine or bromine or C₁-C₆-alkylsulfonyl         such as methylsulfonyl or ethylsulfonyl;         -   especially preferably chlorine, methylsulfonyl or             ethyl-sulfonyl;     -   R⁴ hydrogen or methyl;         -   especially preferably hydrogen;     -   R⁵ is C₁-C₆-alkyl, such as methyl, ethyl, propyl,         1-methyl-ethyl, butyl, 1-methylpropyl or 2-methylpropyl;         -   especially preferably methyl, ethyl or 1-methylethyl;     -   R⁶ hydrogen or C₁-C₆ alkyl, such as methyl or ethyl;         -   especially preferably hydrogen or methyl.

Very particularly preferred are those 3-heterocyclyl-substituted benzoyl derivatives of the formula Ia, in particular the compounds Ia.1 to Ia.47, which are mentioned in Table 1 which follows: TABLE 1 I

No. R¹ R² R³ R⁴ R⁵ R⁶ Ia.1 Cl 4,5-dihydroisoxazol-3-yl SO₂CH₃ H CH₃ CH₃ Ia.2 Cl 4,5-dihydroisoxazol-3-yl Cl H CH₃ CH₃ Ia.3 Cl 4,5-dihydroisoxazol-3-yl SO₂CH₃ H CH₃ H Ia.4 Cl 4,5-dihydro-5-methyl- SO₂CH₃ H CH₃ H isoxazol-3-yl Ia.5 Cl 4,5-dihydro-5,5-di- SO₂CH₃ H CH₃ H methylisoxazol-3-yl Ia.6 Cl 4,5-dihydro-5-ethyl- SO₂CH₃ H CH₃ H isoxazol-3-yl Ia.7 Cl 4,5-dihydro-5,5-di- SO₂CH₃ H CH₃ H ethylisoxazol-3-yl Ia.8 Cl 4,5-dihydro-5-chloro- SO₂CH₃ H CH₃ H methylisoxazol-3-yl Ia.9 Cl 4,5-dihydro-5-eth- SO₂CH₃ H CH₃ H oxyisoxazol-3-yl Ia.10 Cl 4,5-dihydro-5-meth- SO₂CH₃ H CH₃ H oxyisoxazol-3-yl Ia.11 Cl 4,5-dihydro-4,5-di- SO₂CH₃ H CH₃ H methylisoxazol-3-yl Ia.12 Cl 4,5-dihydro-5-thio- SO₂CH₃ H CH₃ H ethylisoxazol-3-yl Ia.13 Cl 4,5-dihydro-5-trifluoro- SO₂CH₃ H CH₃ H methylisoxazol-3-yl Ia.14 Cl 4,5-dihydroisoxazol-3-yl SO₂CH₃ H C₂H₅ H Ia.15 Cl 4,5-dihydroisoxazol-3-yl Cl H C₂H₅ H Ia.16 Cl 4,5-dihydro-5-methyl- SO₂CH₃ H C₂H₅ H isoxazol-3-yl Ia.17 Cl 4,5-dihydro-5,5-di- SO₂CH₃ H C₂H₅ H methylisoxazol-3-yl Ia.18 Cl 4,5-dihydro-5-ethyl- SO₂CH₃ H C₂H₅ H isoxazol-3-yl Ia.19 Cl 4,5-dihydro-5,5-di- SO₂CH₃ H C₂H₅ H ethylisoxazol-3-yl Ia.20 Cl 4,5-dihydro-5-chloro- SO₂CH₃ H C₂H₅ H methylisoxazol-3-yl Ia.21 Cl 4,5-dihydroisoxazol-3-yl SOCH₃ H C₂H₅ H Ia.22 Cl 4,5-dihydro-5-ethoxy- SO₂CH₃ H C₂H₅ H isoxazol-3-yl Ia.23 Cl 4,5-dihydro-4,5-di- SO₂CH₃ H C₂H₅ H methylisoxazol-3-yl Ia.24 Cl 4,5-dihydro-5-thio- SO₂CH₃ H C₂H₅ H ethylisoxazol-3-yl Ia.25 Cl 4,5-dihydro-5-trifluoro- SO₂CH₃ H C₂H₅ H methylisoxazol-3-yl Ia.26 Cl 4,5-dihydroisoxazol-3-yl SO₂CH₃ H i-C₄H₉ H Ia.27 CH₃ 4,5-dihydroisoxazol-3-yl SO₂CH₃ H CH₃ CH₃ Ia.28 CH₃ 4,5-dihydroisoxazol-3-yl Cl H CH₃ CH₃ Ia.29 CH₃ 4,5-dihydroisoxazol-3-yl SO₂CH₃ H CH₃ H Ia.30 CH₃ 4,5-dihydro-5-methyl- SO₂CH₃ H CH₃ H isoxazol-3-yl Ia.31 CH₃ 4,5-dihydro-5,5-di- SO₂CH₃ H CH₃ H methylisoxazol-3-yl Ia.32 CH₃ 4,5-dihydro-5-ethyl- SO₂CH₃ H CH₃ H isoxazol-3-yl Ia.33 CH₃ 4,5-dihydro-5,5-di- SO₂CH₃ H CH₃ H ethylisoxazol-3-yl Ia.34 CH₃ 4,5-dihydroisoxazol-3-yl SO₂CH₃ H CH₃ H Ia.35 CH₃ 4,5-dihydro-4,5-di- SO₂CH₃ H CH₃ H methylisoxazol-3-yl Ia.36 CH₃ 4,5-dihydroisoxazol-3-yl SO₂CH₃ H C₂H₅ H Ia.37 CH₃ 4,5-dihydroisoxazol-3-yl Cl H C₂H₅ H Ia.38 CH₃ 4,5-dihydro-5-methyl- SO₂CH₃ H C₂H₅ H isoxazol-3-yl Ia.39 CH₃ 4,5-dihydro-5,5-di- SO₂CH₃ H C₂H₅ H methylisoxazol-3-yl Ia.40 CH₃ 4,5-dihydro-5-ethyl- SO₂CH₃ H C₂H₅ H isoxazol-3-yl Ia.41 CH₃ 4,5-dihydro-5,5-di- SO₂CH₃ H C₂H₅ H ethylisoxazol-3-yl Ia.42 CH₃ 4,5-dihydro-4,5-di- SO₂CH₃ H C₂H₅ H methylisoxazol-3-yl Ia.43 CH₃ 4,5-dihydroisoxazol-3-yl SO₂CH₃ H i-C₄H₉ H Ia.44 Cl 3-methylisoxazol-5-yl SO₂CH₃ H CH₃ H Ia.45 Cl 3-methylisoxazol-5-yl SO₂CH₃ H C₂H₅ H Ia.46 CH₃ 3-methylisoxazol-5-yl SO₂CH₃ H CH₃ H Ia.47 CH₃ 3-methylisoxazol-5-yl SO₂CH₃ H C₂H₅ H

Also very particularly preferred are the compounds Ib, in particular the compounds 1b.1 to 1b.47, which differ from the compounds Ia.1 to Ia.47 only by the fact that they are present as the sodium salt:

Also very particularly preferred are the compounds Ic, in particular the compounds Ic.1 to Ic.47, which differ from the compounds Ia.1 to Ia.47 only by the fact that they are present as the lithium salt:

Also very particularly preferred are the compounds Id, in particular the compounds Id.1 to Id.47, which differ from the compounds Ia.1 to Ia.47 only by the fact that they are present as the potassium salt:

Also very particularly preferred are the compounds Ie, in particular the compounds Ie.1 to Ie.47, which differ from the compounds Ia.1 to Ia.47 only by the fact that they are present as the ammonium salt:

Very particularly preferred are, especially, the compounds Ia, especially the compounds Ia.1 to Ia.47.

Very particularly preferred are, moreover, the 3-hetero-cyclyl-substituted benzoyl derivatives of the formula I, where

-   -   R⁴ is hydrogen.

Very particularly preferred are, moreover; the 3-hetero-cyclyl substituted benzoyl derivatives of the formula I where

-   -   R² is a heterocyclic radical selected from the group:         isoxazol-3-yl, isoxazol-4-yl and isoxazol-5-yl, it being         possible for the three radicals mentioned to be unsubstituted or         mono- or polysubstituted by halogen, C₁-C₄-alkyl, C₁-C₄-alkoxy,         C₁-C₄-haloalkyl, C₂-C₄-haloalkoxy or C₁-C₄-alkylthio.

Very particularly preferred are, especially, the 3-hetero-cyclyl-substituted benzoyl derivatives of the formula I, where

-   -   R² is isoxazol-3-yl which can be unsubstituted or mono- or         polysubstituted by halogen, C₁-C₄-alkyl, C₁-C₄-alkoxy,         C₁-C₄-haloalkyl, C₁-C₄-haloalkoxy or C₁-C₄-alkylthio;     -   R⁴ is hydrogen.

Very particularly preferred are also, especially, the 3-heterocyclyl-substituted benzoyl derivatives of the formula I where

-   -   R² is isoxazol-5-yl, which can be unsubstituted or mono- or         polysubstituted by halogen, C₁-C₄-alkyl, C₁-C₄-alkoxy,         C₁-C₄-haloalkyl, C₁-C₄-haloalkoxy or C₁-C₄-alkylthio;     -   R⁴ is hydrogen.

Most particularly preferred is 4-[2-chloro-3-(3-methyl-isoxazol-5-yl) -4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole.

Most particularly preferred is also 4-[2-methyl-3-(3-methyl-isoxazol-5-yl) -4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole.

Very particularly preferred are, moreover, the 3-hetero-cyclyl-substituted benzoyl derivatives of the formula I where

-   -   R² is a heterocyclic radical selected from the group:         4,5-dihydroisoxazol-3-yl, 4,5-dihydroisoxazol-4-yl and         4,5-dihydroisoxazol-5-yl, it being possible for the three         radicals mentioned to be unsubstituted or mono- or         polysubstituted by halogen, C₁-C₄-alkyl, C₁-C₄-alkoxy,         C₁-C₄-haloalkyl, C₁-C₄-haloalkoxy or C₁-C₄-alkylthio.

Very particularly preferred are, especially, the 3-hetero-cyclyl-substituted benzoyl derivatives of the formula I where

-   -   R² is 4,5-dihydroisoxazol-3-yl which can be unsubstituted or         mono- or polysubstituted by halogen, C₁-C₄-alkyl, C₁-C₄-alkoxy,         C₁-C₄-haloalkyl, C₁-C₄-haloalkoxy or C₁-C₄-alkylthio;     -   R⁴ is hydrogen.

Most particularly preferred are the 3-heterocyclyl-substituted benzoyl derivatives of the formula I where

-   -   R¹ is halogen or C₁-C₆-alkyl; and     -   R² is 4,5-dihydroisoxazol-3-yl which can be unsubstituted or         mono- or polysubstituted by halogen, C₁-C₄-alkyl, C₁-C₄-alkoxy,         C₁-C₄-haloalkyl, C₁-C₄-haloalkoxy or C₁-C₄-alkylthio;     -   R³ is C₁-C₆-alkylsulfonyl;     -   R⁴ is hydrogen.

Most especially preferred is 4-[2-chloro-3-(4,5-dihydro-isoxazol-3-yl)-4-methylsulfonylbenzoyl]-1-methyl-5-hydroxy-1H-pyrazole.

Most particularly preferred is also 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole.

In a further particular embodiment, the synergistic herbicidal mixture comprises, as component A at least a compound of the formula I, as component B the compound of formula IIa, and, if desired the compound of formula IIb, and, if desired, as component C at least one herbicidal compound from the group of the acetyl-CoA carboxylase inhibitors (ACC), acetolactate synthase inhibitors (ALS), amides, auxin herbicides, auxin transport inhibitors, carotenoid biosynthesis inhibitors, enolpyruvylshikimate 3-phosphate synthase inhibitors (EPSPS), glutamine synthetase inhibitors, lipid biosynthesis inhibitors, mitosis inhibitors, protoporphyrinogen IX oxidase inhibitors, photosynthesis inhibitors, synergists, growth substances, cell wall biosynthesis inhibitors and a variety of other herbicides; or the respective environmentally compatible salts thereof.

In a further particular embodiment, the synergistic herbicidal mixture comprises, as herbicides the components A and B, wherein the component A comprises at least a compound of the formula I, and the component B comprises at least the compound of formula IIa or the compound of formula IIb.

In an especial particular embodiment, the synergistic herbicidal mixture comprises, two or three herbicidal active compounds, a compound of formula I (component A), the compound of formula IIa and/or the compound of formula IIb (component B).

In an extraordinary particular embodiment, the synergistic herbicidal mixture comprises, two herbicidal active compounds, a compound of formula I (component A) and the compound of formula IIa (component B).

For particular preferred embodiments, the respective preferences described above apply analogously.

In particular the synergistic herbicidal mixture comprises as component A 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole and as component B the compound of formula IIa.

In a further extraordinary particular embodiment, the synergistic herbicidal mixture comprises, three herbicidal active compounds, a compound of formula I (component A) and as component B the compound of formula IIa and the compound of formula IIb.

For particular preferred embodiments, the respective preferences described above apply analogously.

In particular the synergistic herbicidal mixture comprises as component A 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole and as component B the compound of formula IIa and the compound of formula IIb.

In a further extraordinary particular embodiment, the synergistic herbicidal mixture comprises, two herbicidal active compounds, a compound of formula I (component A) and the compound of formula IIb (component B).

For particular preferred embodiments, the respective preferences described above apply analogously.

In particular the synergistic herbicidal mixture comprises as component A 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole and as component B the compound of formula IIb.

In a further particular embodiment, the synergistic herbicidal mixture comprises, at least,

-   -   as component A) a 3-heterocyclyl-substituted benzoyl derivative         of the formula I;     -   as component B) at least the compound of formula IIa or the         compound of formula IIb; and     -   as component C) at least one herbicidal compound from the group         of the acetyl-CoA carboxylase inhibitors (ACC), acetolactate         synthase inhibitors (ALS), amides, auxin herbicides, auxin         transport inhibitors, carotenoid biosynthesis inhibitors,         enolpyruvylshikimate 3-phosphate synthase inhibitors (EPSPS),         glutamine synthetase inhibitors, lipid biosynthesis inhibitors,         mitosis inhibitors, protoporphyrinogen IX oxidase inhibitors,         photosynthesis inhibitors, synergists, growth substances, cell         wall biosynthesis inhibitors and a variety of other herbicides.

For particular preferred embodiments, the respective preferences described above apply analogously.

In an especial particular embodiment, the synergistic herbicidal mixture comprises, at least,

-   -   as component A) a 3-heterocyclyl-substituted benzoyl derivative         of the formula I;     -   as component B) the compound of formula IIa and, if desired, the         compound of formula IIb; and     -   as component C) at least one herbicidal compound from the group         of the acetyl-CoA carboxylase inhibitors (ACC), acetolactate         synthase inhibitors (ALS), amides, auxin herbicides, auxin         transport inhibitors, carotenoid biosynthesis inhibitors,         enolpyruvylshikimate 3-phosphate synthase inhibitors (RPSPS),         glutamine synthetase inhibitors, lipid biosynthesis inhibitors,         mitosis inhibitors, protoporphyrinogen IX oxidase inhibitors,         photosynthesis inhibitors, synergists, growth substances, cell         wall biosynthesis inhibitors and a variety of other herbicides.

For particular preferred embodiments, the respective preferences described above apply analogously.

In an extraordinary particular embodiment, the synergistic herbicidal mixture comprises, at least,

-   -   as component A) a 3-heterocyclyl-substituted benzoyl derivative         of the formula I;     -   as component B) the compound of formula IIa; and     -   as component C) at least one herbicidal compound from the group         of the acetyl-CoA carboxylase inhibitors (ACC), acetolactate         synthase inhibitors (ALS), amides, auxin herbicides, auxin         transport inhibitors, carotenoid biosynthesis inhibitors,         enolpyruvylshikimate 3-phosphate synthase inhibitors (EPSPS),         glutamine synthetase inhibitors, lipid biosynthesis inhibitors,         mitosis inhibitors, protoporphyrinogen IX oxidase inhibitors,         photosynthesis inhibitors, synergists, growth substances, cell         wall biosynthesis inhibitors and a variety of other herbicides.

For particular preferred embodiments, the respective preferences described above apply analogously.

In an extraordinary preferred embodiment, the synergistic herbicidal mixture comprises three herbicidal active compounds, a compound of formula I (component A), as component B the compound of formula IIa and as component C) a herbicidal compound from the group of the acetyl-CoA carboxylase inhibitors (ACC), acetolactate synthase inhibitors (ALS), amides, auxin herbicides, auxin transport inhibitors, carotenoid biosynthesis inhibitors, enolpyruvylshikimate 3-phosphate synthase inhibitors (EPSPS), glutamine synthetase inhibitors, lipid biosynthesis inhibitors, mitosis inhibitors, protoporphyrinogen IX oxidase inhibitors, photosynthesis inhibitors, synergists, growth substances, cell wall biosynthesis inhibitors and a variety of other herbicides.

In a further extraordinary preferred embodiment, the synergistic herbicidal mixture comprises four herbicidal active compounds, a compound of formula I (component A), as component B the compound of formula IIa and as component C) two herbicidal compound from the group of the acetyl-CoA carboxylase inhibitors (ACC), acetolactate synthase inhibitors (ALS), amides, auxin herbicides, auxin transport inhibitors, carotenoid biosynthesis inhibitors, enolpyruvylshikimate 3-phosphate synthase inhibitors (EPSPS), glutamine synthetase inhibitors, lipid biosynthesis inhibitors, mitosis inhibitors, protoporphyrinogen IX oxidase inhibitors, photosynthesis inhibitors, synergists, growth substances, cell wall biosynthesis inhibitors and a variety of other herbicides.

In a further particular embodiment, the synergistic herbicidal mixture comprises, at least,

-   -   as component A) a 3-heterocyclyl-substituted benzoyl derivative         of the formula I;     -   as component B) the compound of formula IIb; and     -   as component C) at least one herbicidal compound from the group         of the acetyl-CoA carboxylase inhibitors (ACC), acetolactate         synthase inhibitors (ALS), amides, auxin herbicides, auxin         transport inhibitors, carotenoid biosynthesis inhibitors,         enolpyruvylshikimate 3-phosphate synthase inhibitors (EPSPS),         glutamine synthetase inhibitors, lipid biosynthesis inhibitors,         mitosis inhibitors, protoporphyrinogen IX oxidase inhibitors,         photosynthesis inhibitors, synergists, growth substances, cell         wall biosynthesis inhibitors and a variety of other herbicides.

For particular preferred embodiments, the respective preferences described above apply analogously.

In a further particular embodiment, the synergistic herbicidal mixture comprises three herbicidal active compounds, a compound of formula I (component A), as component B the compound of formula IIb and as component C) a herbicidal compound from the group of the acetyl-CoA carboxylase inhibitors (ACC), acetolactate synthase inhibitors (ALS), amides, auxin herbicides, auxin transport inhibitors, carotenoid biosynthesis inhibitors, enolpyruvylshikimate 3-phosphate synthase inhibitors (EPSPS), glutamine synthetase inhibitors, lipid biosynthesis inhibitors, mitosis inhibitors, protoporphyrinogen IX oxidase inhibitors, photosynthesis inhibitors, synergists, growth substances, cell wall biosynthesis inhibitors and a variety of other herbicides.

In a further particular embodiment, the synergistic herbicidal mixture comprises four herbicidal active compounds, a compound of formula I (component A), as component B the compound of formula IIb and as component C) two herbicidal compound from the group of the acetyl-CoA carboxylase inhibitors (ACC), acetolactate synthase inhibitors (ALS), amides, auxin herbicides, auxin transport inhibitors, carotenoid biosynthesis inhibitors, enolpyruvylshikimate 3-phosphate synthase inhibitors (EPSPS), glutamine synthetase inhibitors, lipid biosynthesis inhibitors, mitosis inhibitors, protoporphyrinogen IX oxidase inhibitors, photosynthesis inhibitors, synergists, growth substances, cell wall biosynthesis inhibitors and a variety of other herbicides.

In a further particular embodiment, the synergistic herbicidal mixture comprises at least four herbicidal active compounds, a compound of formula I (component A), as component B the compound of formula IIa and the compound of formula IIb and as component C) a herbicidal compound from the group of the acetyl-CoA carboxylase inhibitors (ACC), acetolactate synthase inhibitors (ALS), amides, auxin herbicides, auxin transport inhibitors, carotenoid biosynthesis inhibitors, enolpyruvylshikimate 3-phosphate synthase inhibitors (EPSPS), glutamine synthetase inhibitors, lipid biosynthesis inhibitors, mitosis inhibitors, protoporphyrinogen IX oxidase inhibitors, photosynthesis inhibitors, synergists, growth substances, cell wall biosynthesis inhibitors and a variety of other herbicides.

In a further particular embodiment, the synergistic herbicidal mixture comprises four herbicidal active compounds, a compound of formula I (component A), as component B the compound of formula IIa and the compound of formula IIb and as component C) a herbicidal compound from the group of the acetyl-CoA carboxylase inhibitors (ACC), acetolactate synthase inhibitors (ALS), amides, auxin herbicides, auxin transport inhibitors, carotenoid biosynthesis inhibitors, enolpyruvylshikimate 3-phosphate synthase inhibitors (EPSPS), glutamine synthetase inhibitors, lipid biosynthesis inhibitors, mitosis inhibitors, protoporphyrinogen IX oxidase inhibitors, photosynthesis inhibitors, synergists, growth substances, cell wall biosynthesis inhibitors and a variety of other herbicides.

In a further particular embodiment, the synergistic herbicidal mixture comprises five herbicidal active compounds, a compound of formula I (component A), as component B the compound of formula IIa and the compound of formula IIb and as component C) two herbicidal compound from the group of the acetyl-CoA carboxylase inhibitors (ACC), acetolactate synthase inhibitors (ALS), amides, auxin herbicides, auxin transport inhibitors, carotenoid biosynthesis inhibitors, enolpyruvylshikimate 3-phosphate synthase inhibitors (EPSPS), glutamine synthetase inhibitors, lipid biosynthesis inhibitors, mitosis inhibitors, protoporphyrinogen IX oxidase inhibitors, photosynthesis inhibitors, synergists, growth substances, cell wall biosynthesis inhibitors and a variety of other herbicides.

With a view to the synergistic herbicidal action of the mixtures comprising a component A), B) and C) according to the invention, compounds from amongst groups C1 to C14 or C16, preferably from amongst groups C5, C9 and C12, especially from amongst groups C9 and C12, are preferred as component C).

In particular, compounds from amongst the classes of active ingredients mentioned below are preferred, or the following compounds are very particularly preferred:

-   -   C1 acetyl-CoA carboxylase inhibitors (ACC):         -   cyclohexenone oxime ethers, in particular cycloxydim,             sethoxydim or tralkoxydim, preferably sethoxydim or             tralkoxydim; or         -   phenoxyphenoxypropionic esters, in particular             clodinafop-propargyl (and, if appropriate, cloquintocet),             fenoxaprop-ethyl or fenoxaprop-P-ethyl, preferably             clodinafop-propargyl (and, if appropriate, cloquintocet) or             fenoxaprop-P-ethyl;     -   C2 acetolactate synthase inhibitors (ALS):         -   imidazolinones, in particular imazapyr, imazaquin,             imazamethabenz, imazethapyr or imazamox, preferably             imazapyr;         -   pyrimidyl ethers, in particular pyrithiobac sodium;         -   sulfonamides, in particular florasulam, flumetsulam or             metosulam, preferably metosulam; or         -   sulfonylureas, in particular halosulfuron-methyl,             nicosulfuron, primisulfuron-methyl, prosulfuron,             rimsulfuron, thifensulfuron-methyl, tribenuron-methyl,             N-[[[4-methoxy-6-(trifluoromethyl)-1,3,5-triazin-2-yl]-amino)carbonyl]-2-(trifluoro-methyl)-benzenesulfonamide             sulfosulfuron or iodosulfuron; especially             halosulfuron-methyl, nicosulfuron, primisulfuron-methyl,             prosulfuron, rimsulfuron, thifensulfuron-methyl,             tribenuron-methyl,             N-[[[4-methoxy-6-(trifluoromethyl)-1,3,5-triazin-2-yl]-amino]carbonyl]-2-(trifluoromethyl)-benzenesulfonamide             or sulfosulfuron;     -   C3 amides:         -   fluthiamide;     -   C4 auxin herbicides:         -   pyridinecarboxylic acids, in particular clopyralid; or         -   2,4-D;     -   C5 auxin transport inhibitors:         -   diflufenzopyr;     -   C6 carotenoid biosynthesis inhibitors:         -   isoxaflutole, mesotrione, isoxachloride, ketospiradox or             sulcotrione (chlormesulone), in particular isoxaflutole or             sulcotrione;     -   C7 enolpyruvylshikimate-3-phosphate synthase inhibitors (EPSPS):         -   glyphosate or sulfosate;     -   C8 glutamin synthetase inhibitors:         -   glufosinate-ammonium;     -   C9 lipid biosynthesis inhibitors:         -   chloroacetanilides, in particular dimethenamid,             S-dimethenamid, acetochlor, metolachlor or S-metolachlor,         -   thioureas, in particular benthiocarb;     -   C10 mitosis inhibitors:         -   dinitroanilines, in particular pendimethalin;     -   C11 protoporphyrinogen IX oxidase inhibitors:         -   diphenyl ethers, in particular acifluorfen or             acifluorfen-sodium;         -   oxadiazoles, in particular oxadiargyl; or         -   cyclic imides, in particular butafenacil,             carfentrazone-ethyl, cinidon-ethyl or flumiclorac-pentyl,             preferably carfentrazone-ethyl, cinidon-ethyl or             flumidorac-pentyl;         -   pyrazoles, in particular JTV 85;     -   C12 photosynthesis inhibitors:         -   pyridate or pyridafol, in particular pyridate;         -   benzothiadiazinones, in particular bentazone;         -   dipyridylenes, in particular paraquat-dichloride;         -   ureas, in particular diuron or isoproturon, preferably             diuron;         -   phenols, in particular bromoxynil;         -   chloridazone;         -   triazines, in particular atrazine or terbutyl-azine; or         -   triazinones, in particular metribuzin;     -   C13 synergists:         -   oxiranes, in particular tridiphane;     -   C14 growth substances:         -   aryloxyalkanoic acids, in particular fluoroxypyr, MCPA or             mecoprop-P;         -   benzoic acids, in particular dicamba; or         -   quinolinecarboxylic acids, in particular quinclorac;     -   C16 various other herbicides:         -   triaziflam.

In particular, compounds from amongst the classes of active ingredients mentioned below are preferred, or the following compounds are very particularly preferred.

-   -   C5 auxin transport inhibitors:         -   diflufenzopyr;     -   C9 lipid biosynthesis inhibitors:         -   chloroacetanilides, in particular dimethenamid,             S-dimethenamid, acetochlor, metolachlor or S-metolachlor,         -   thioureas, in particular benthiocarb;     -   C12 photosynthesis inhibitors:         -   pyridate;         -   benzothiadiazinones, in particular bentazone;         -   dipyridylenes, in particular paraquat-dichloride;         -   ureas, in particular diuron or isobroturon, preferably             diuron;         -   phenols, in particular bromoxynil;         -   chloridazon;         -   triazines, in particular atrazine or terbutyl-azine; or         -   triazinones, in particular metribuzin;

In particular, compounds from amongst the classes of active ingredients mentioned below are extraordinary preferred, or the following compounds are very particularly preferred.

-   -   C9 lipid biosynthesis inhibitors:         -   chloroacetanilides, in particular dimethenamid,             S-dimethenamid, acetochlor, metolachlor or S-metolachlor,         -   thioureas, in particular benthiocarb;     -   C12 photosynthesis inhibitors:         -   pyridate;         -   benzothiadiazinones, in particular bentazone;         -   dipyridylenes, in particular paraquat-dichloride;         -   ureas, in particular diuron or isobroturon, preferably             diuron;         -   phenols, in particular bromoxynil;         -   chloridazon;         -   triazines, in particular atrazine or terbutyl-azine; or         -   triazinones, in particular metribuzin;

Especially preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydro-isoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula IIa and as component C) an auxin transport inhibitor, in particular diflufenzopyr.

Also especially preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydro-isoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula IIa and as component C) a herbicidal compound from the group C9.

Also especially preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-di-hydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula IIa and as component C a chloroacetanilide, in particular acetochlor.

Also especially preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula IIa and as component C) a herbicidal compound from the group C12.

Also especially preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-di-hydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula IIa and as component C a triazine, in particular atrazine.

Also especially preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula IIa and as component C) a herbicidal compound from the group C5 and a herbicidal compound from the group C12.

Also especially preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-di-hydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula IIa and as component C a auxin transport inhibitor and a triazine.

Also especially preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-di-hydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula IIa and as component C diflufenzopyr and atrazine.

Also especially preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydro-isoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula IIb and as component C) an auxin transport inhibitor, in particular diflufenzopyr.

Also especially preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydro-isoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula IIb and as component C) a herbicidal compound from the group C9.

Also especially preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-di-hydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula IIb and as component C a chloroacetanilide, in particular acetochlor.

Also specially preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydro-isoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula IIb and as component C) a herbicidal compound from the group C12.

Also especially preferred are synergistic herbicidal mixtures which comprise as component A 4-(2-methyl-3-(4,5-di-hydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula IIb and as component C a triazine, in particular atrazine.

Also especially preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula IIb and as component C) a herbicidal compound from the group C5 and a herbicidal compound from the group C12.

Also especially preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-di-hydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula IIb and as component C a auxin transport inhibitor and a triazine.

Also especially preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-di-hydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula IIb and as component C diflufenzopyr and atrazine.

Also especially preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydro-isoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula IIa and the compound of formula IIb, and as component C) an auxin transport inhibitor, in particular diflufenzopyr.

Also especially preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula IIa and the compound of formula IIb, and as component C) a herbicidal compound from the group C9.

Also especially preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula IIa and the compound of formula IIb, and as component C a chloroacetanilide, in particular acetochlor.

Also preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula IIa and the compound of formula IIb, and as component C) a herbicidal compound from the group C12.

Also especially preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula IIa and the compound of formula IIb, and as component C a triazine, in particular atrazine.

Also especially preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula IIa and the compound of formula IIb and as component C) a herbicidal compound from the group C5 and a herbicidal compound from the group C12.

Also especially preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula IIa and the compound of formula IIb and as component C a auxin transport inhibitor and a triazine.

Also especially preferred are synergistic herbicidal mixtures which comprise as component A 4-(2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula IIa and the compound of formula IIb and as component C diflufenzopyr and atrazine.

The present invention also extends to herbicidal compositions which comprise a herbicidally active amount of a synergistic herbicidal mixture (comprising components A), B) and, if desired, C) as described above), at least one liquid and/or solid carrier and, if desired, at least one surfactant.

The herbicidal compositions and synergistic herbicidal mixtures according to the invention can effect very good control of broad-leaved weeds and grass weeds in crops such as maize, cereals, rice and soya without damaging the crop plants, an effect observed especially even at low rates of application.

Taking into consideration the variety of application method in question, the herbicidal compositions and synergistic herbicidal mixtures according to the invention can additionally be employed in a further number of crop plants for eliminating undesirable plants. Examples of suitable crops are the following:

Allium cepa, Ananas comosus, Arachis hypogaea, Asparagus officinalis, Beta vulgaris ssp. altissima, Beta vulgaris ssp. rapa, Brassica napus var. napus, Brassica napus var. napobrassica, Brassica rapa var. silvestris, Camellia sinensis, Carthamus tinctorius, Carya illinoinensis, Citrus limon, Citrus sinensis, Coffea arabica (Coffea canephora, Coffea liberica), Cucumis sativus, Cynodon dactylon, Daucus carota, Elaeis guineensis, Fragaria vesca, Glycine max, Gossypium hirsutum, (Gossypium arboreum, Gossypium herbaceum, Gossypium vitifolium), Helianthus annuus, Hevea brasiliensis, Hordeum vulgare, Humulus lupulus, Ipomoea batatas, Juglans regia, Lens culinaris, Linum usitatissimum, Lycopersicon lycopersicum, Malus spp., Manihot esculenta, Medicago sativa, Musa spp., Nicotiana tabacum (N. rustica), Olea europaea, Oryza sativa, Phaseolus lunatus, Phaseolus vulgaris, Picea abies, Pinus spp., Pisum sativum Prunus avium, Prunus persica, Pyrus communis, Ribes sylvestre, Ricinus communis, Saccharum officinarum, Secale cereale, Solanum tuberosum, Sorghum bicolor (s. vulgare), Theobroma cacao, Trifolium pratense, Triticum aestivum, Triticum durum, Vicia faba, Vitis vinifera und Zea mays.

Moreover, the herbicidal compositions and synergistic herbicidal mixtures according to the invention can also be used in crops which tolerate the action of herbicides due to breeding, including genetic engineering methods.

The mixtures according to the invention, or the herbicidal compositions comprising them, can be employed, for example, in the form of directly sprayable aqueous solutions, powders, suspensions, also highly-concentrated aqueous, oily or other suspensions or dispersions, emulsions, oil dispersions, pastes, dusts, materials for spreading or granules, by means of spraying, atomizing, dusting, spreading or pouring.

The use forms depend on the intended purposes; in any case, they should guarantee the finest possible distribution of the active ingredients according to the invention.

Suitable inert auxiliaries are mineral oil fractions of medium to high boiling point such as kerosene and diesel oil, furthermore coal tar oils and oils of vegetable or animal origin, aliphatic, cyclic and aromatic hydrocarbons, e.g. paraffins, tetrahydronaphthalene, alkylated naphthalenes and their derivatives, alkylated benzenes and their derivatives, alcohols such as methanol, ethanol, propanol, butanol and cyclohexanol, ketones such as cyclohexanone, strongly polar solvents, such as N-methylpyrrolidone and water.

Aqueous use forms can be prepared from emulsion concentrates, suspensions, pastes, wettable powders or water-dispersible granules by adding water. To prepare emulsions, pastes or oil dispersions, the substances, as such or dissolved in an oil or solvent, can be homogenized in water by means of wetting agent, tackifier, dispersant or emulsifier. However, it is also possible to prepare concentrates composed of active substance, wetting agent, tackifier, dispersant or emulsifier and, if appropriate, solvent or oil, and these concentrates are suitable for dilution with water.

Suitable surfactants are the alkali metal, alkaline earth metal and ammonium salts of aromatic sulfonic acids, e.g. ligno-, phenol-, naphthalene- and dibutylnaphthalenesulfonic acid, and of fatty acids, of alkyl- and alkylaryl sulfonates, of alkyl sulfates, lauryl ether sulfates and fatty alcohol sulfates, and salts of sulfated hexa-, hepta- and octadecanols, and of fatty alcohol glycol ether, condensates of sulfonated naphthalene and its derivatives with formaldehyde, condensates of naphthalene, or of the naphthalenesulfonic acids, with phenol and formaldehyde, polyoxyethylene octylphenyl ether, ethoxylated isooctyl-, octyl- or nonylphenol, alkylphenyl and tributylphenyl polyglycol ether, alkylaryl polyether alcohols, isotridecyl alcohol, fatty alcohol/ethylene oxide condensates, ethoxylated castor oil, polyoxyethylene alkyl ethers or polyoxypropylene alkyl ethers, lauryl alcohol polyglycol ether acetate, sorbitol esters, lignin-sulfite waste liquors or methylcellulose.

Powders, materials for spreading and dusts can be prepared by mixing or concomitantly grinding the synergistic herbicidal mixture or the individual active ingredients with a solid carrier.

Granules, e.g. coated granules, impregnated granules and homogeneous granules, can be prepared by binding the active ingredients to solid carriers. Solid carriers are mineral earths such as silicas, silica gels, silicates, talc, kaolin, limestone, lime, chalk, bole, loess, clay, dolomite, diatomaceous earth, calcium sulfate, magnesium sulfate, magnesium oxide, ground synthetic material, fertilizers such as ammonium sulfate, ammonium phosphate, ammonium nitrate, ureas and products of vegetable origin such as cereal meal, tree bark meal, wood meal and nutshell meal, cellulose powders or other solid carriers.

The concentrations of the mixtures according to the invention in the ready-to-use products can be varied within wide ranges. In general, the formulations comprise from 0.01 to 95% by weight, preferably 0.5 to 90% by weight, of the mixture according to the invention.

The components A) and B) and, if desired, C) can be formulated jointly, but also separately, and/or applied to the plants, their environment and/or seeds jointly or separately. It is preferable to apply the active ingredients simultaneously. However, it is also possible to apply them separately.

Also the respective herbicides of the components A), B) and C), especially the compound of formula IIa and the compound of formula IIb can be formulated jointly, but also separately, and/or applied to the plants, their environment and/or seeds jointly or separately.

Moreover, it may be advantageous to apply the herbicidal compositions and synergistic herbicidal mixtures according to the invention, jointly or separately, with additional other crop protection agents, for example with pesticides or agents for controlling phytopathogenic fungi or bacteria. Also of interest is the miscibility with mineral salt solutions which are employed for treating nutritional and trace element deficiencies. Non-phytotoxic oils and oil concentrates can also be added.

The mixtures according to the invention and the herbicidal compositions can be applied pre- or post-emergence. If the active ingredients are less well tolerated by certain crop plants, application techniques may be used in which the herbicidal compositions are sprayed, with the aid of the spray apparatus, in such a way that they come into as little contact, if any, with the leaves of the sensitive crop plants while reaching the leaves of undesirable plants which grow underneath, or the bare soil (post-directed, lay-by).

In the case of a post-emergence treatment of the plants, the herbicidal compositions according to the invention are preferably applied by foliar application. Application may be effected, for example, by usual spraying techniques with water as the carrier, using amounts of spray mixture of approx. 100 to 1000 1/ha. The compositions may also be applied by the so-called “low-volume” and “ultra-low-volume” methods, or in the form of so-called granules.

As a rule, the synergistic herbicidal mixtures comprise components A), B) and, if desired, C) in such weight ratios that the synergistic effect takes place.

The ratios of component A) and B) in the mixture preferably range from 1:0.001 to 1:500, preferably from 1:0.01 to 1:200, particularly preferably from 1:0.01 to 1:100, especially from from 1:0.1 to 1:50.

The ratios of components A) and C) in the mixture preferably range from 1:0.002 to 1:800, preferably from 1:0.003 to 1:250, particularly preferably from 1:0.003 to 1:160, especially from 1:0.02 to 1:250, especially preferably from 1:0.02 to 1:160.

The rate of application of pure synergistic herbicidal mixture, i.e. without formulation auxiliaries, amounts to 0.2 to 5000 g/ha, preferably to 2 to 2000 g/ha, in particular to 5 to 1500 g/ha, especially to 8 to 1500 g/ha, of active substance (a.s.), depending on the intended aim, the season, the target plants and growth stage.

The rate of application of 3-heterocyclyl-substituted benzoyl derivative of the formula I is 0.1 to 250 g/ha, as a rule 1 to 250 g/ha, preferably 5 to 250 g/ha, especially 10 to 150 g/ha, of active substance (a.s.).

The preferred rate of application of component B) is 0.1 to 500 g/ha, as a rule 1 to 250 g/ha, preferably 10 to 250 g/ha, of active substance (a.s.)

The preferred application rate of the active ingredients of the optional component C are compiled in Table 2. TABLE 2 Rate of application Component C Class of active ingredient Active ingredient (g/ha) C1 acetyl-CoA carboxylase inhibitors  25-400 cyclohexenone oxime ethers 100-400 cycloxydim 100-400 sethoxydim 100-400 tralkoxydim 100-400 phenoxyphenoxypropionic esters  25-300 clodinafpop-P-propargyl^(a)  25-100 fenoxaprop-ethyl  50-300 fenoxaprop-P-ethyl  25-150 C2 acetolactate synthase inhibitors (ALS)  1-800 imidazolinones  20-800 imazapyr  30-400 imazaquin  50-300 imazamethabenz 100-800 imazapic  20-800 imazethapyr  30-150 imazamox  20-120 pyrimidyl ethers  2-120 pyrithiobac-sodium  2-120 sulfonamides  1-225 florasulam  1-20 flumetsulam  2-225 metosulam  1-60 sulfonylureas  1-120 halosulfuron-methyl  5-120 nicosulfuron  1-120 primisulfuron-methyl  10-120 prosulfuron  10-120 rimsulfuron  5-120 thifensulfuron-methyl 10-60 tribenuron-methyl 10-60 N-[[[4-methoxy-6-(trifluoro-  5-120 methyl)-1,3,5-triazin-2-yl]- amino]carbonyl]-2-(trifluoro- methyl)benzenesulfonamide sulfosulfuron 10-60 C3 amides  250-2000 — fluthiamide  250-2000 C4 auxin herbicides  25-750 pyridinecarboxylic acids  25-750 clopyralid  25-750 — 2,4-D  50-750 C5 auxin transport inhibitors  15-100 — diflufenzopyr  15-100 C6 carotenoid biosynthesis inhibitors  25-600 — isoxaflutole  25-200 — sulcotrione 100-600 — mesotrione  25-300 — isoxachlortole  25-200 — ketospiradox  25-300 C7 enolpyruvylshikimat-3-phosphate  360-1080 synthase inhibitors (EPSPS) — glyphosate  360-1080 — sulfosate  360-1080 C8 glutamine synthetase inhibitors  10-600 — glufosinate-ammonium  10-600 C9 lipid biosynthesis inhibitors  60-4000 chloroacetanilides  60-4000 dimethenamid  60-2000 S-dimethenamid  60-2000 acetochlor  250-4000 metolachlor  60-4000 S-metolachlor  60-4000 thioureas  100-4000 benthiocarb 1000-4000 C10 mitosis inhibitors  375-3000 dinitroanilines  375-3000 pendimethalin  375-3000 C11 protoporphyrinogen IX oxidase  0.5-600  inhibitors diphenyl ethers  50-300 acifluorfen  50-300 acifluorfen-sodium  50-300 oxadiazoles  50-600 oxadiargyl  50-600 cyclic imides  0.5-300  carfentrazone-ethyl 0.5-35  cinidon-ethyl  3-35 flumiclorac-pentyl  3-35 butafenacil  5-300 JV 485  50-300 C12 photosynthesis inhibitors  30-4000 — pyridate  250-1500 pyridafol  250-1000 benzothiadiazinones  480-1440 bentazone  480-1440 dipyridylenes 100-800 paraquat-dichloride 100-800 ureas  250-1600 diuron  250-1600 isoprotoron  250-1600 phenols 100-700 bromoxynil 100-700 chloridazon  500-4000 triazines  25-4000 atrazine  25-4000 terbutylazine  125-4000 triazinone  30-300 metribuzin  30-300 C13 synergists  500-1500 oxiranes  500-1500 tridiphane  500-1500 C14 growth substances  25-1200 aryloxyalkanoic acids  50-1200 fluoroxypyr  50-400 MCPA  400-1200 mecoprop-P  400-1200 benzoic acids  75-800 dicamba  75-800 quinolinecarboxylic acids  25-600 quinclorac  25-600 C16 various other herbicides — triaziflam  50-750 ^(a)If appropriate, 10-50 g/ha Cloquintocet may also be added.

USE EXAMPLES

The mixtures according to the invention were applied pre- or post-emergence (foliar treatment). The herbicidal compounds of component B and, if desired, of component C were applied in the formulation in which they are present as commercially available product.

The herbicidally active compounds of components A), B) and, if desired, C) were applied in succession or jointly, in the latter case in some cases as a tank mix and in some cases as a ready-mix, in the form of emulsions, aqueous solutions or-suspensions, the vehicle being water (300-400 l/ha). In the case of the field trials, application was effected with the aid of a mobile plot sprayer.

The test period extended over 3 to 8 weeks, and the stands were also observed at later points in time.

Damage by the herbicidal compositions was evaluated with reference to a scale of 0% to 100% in comparison with untreated control plots. 0 means no damage and 100 means complete destruction of the plants.

The following examples will demonstrate the action of the herbicidal compositions which can be used according to the invention, without excluding the possibility of other uses.

In these examples, the value E at which only an additive effect of the individual active ingredients is to be expected was calculated by the method of S. R. Colby (Calculating synergistic and antagonistic responses of herbicide combinations, Weeds 15, 20 pp (1967)).

This was done using the formula $E = {X + Y - \frac{XY}{100}}$ where

-   -   X=Percentage of the herbicidal action of component X) at an         application rate of x;     -   Y=Percentage of the herbicidal action of component Y) at an         application rate of y;     -   E=expected herbicidal action of component X)+Y) at rates of         application x+y (in %).

If the value observed exceeds the value E calculated in accordance with Colby's formula, then synergism is present.

The herbicidal mixtures according to the invention exert a greater herbicidal action than would have been expected according to Colby on the basis of the observed effects of the individual components when used alone.

The results of the tests are shown in Tables 3 to 12 below.

In these studies, the following plants were used: Scientific name Common name Abutilon theophrasti Velvetleaf Brachiaria plantaginea Alexandergrass Echinochloa crus-galli Barnyardgrass Galium aparine Catchweed Pharbitis purpurea Morningglory Polygonum persicaria Ladysthumb Setaria faberi Faber's foxtail

TABLE 3 Herbicidal action of compound 1a.29 and compound IIa (post-emergence treatment; greenhouse) Application Abutilon rate theophrasti Colby [g/ha ai] Damage [%] Value E Ia.29 3.91 60 IIa 3.91 60 Ia.29 + IIa 3.91 + 3.91 85 84

TABLE 4 Herbicidal action of compound 1a.29 and compound IIa (post-emergence treatment; greenhouse) Application Galium rate aparine Colby [g/ha ai] Damage [%] Value E Ia.29 7.81 70 IIa 7.81 80 Ia.29 + IIa 7.81 + 7.81 95 94

TABLE 5 Herbicidal action of compound 1a.29 compound IIa and compound IIb (post-emergence treatment; greenhouse) Application Echinochloa rate crus-galli Colby [g/ha ai] Damage [%] Value E Ia.29 + IIb 3.91 + 125 60 IIa 3.91 25 Ia.29 + IIb + IIa 3.91 + 125 + 3.91 85 70

TABLE 6 Herbicidal action of compound 1a.29 compound IIa and compound IIb (post-emergence treatment; greenhouse) Application Setaria rate faberi Colby [g/ha ai] Damage [%] Value E Ia.29 + IIa 7.81 + 7.81 90 IIb 250 20 Ia.29 + IIa + IIb 7.81 + 7.81 + 250 98 92

TABLE 7 Herbicidal action of compound 1a.29 compound IIa and compound IIb (post-emergence treatment; greenhouse) Application Setaria rate faberi Colby [g/ha ai] Damage [%] Value E Ia.29 + IIa 3.91 + 3.91 85 IIb 125 20 Ia.29 + IIa + IIb 3.91 + 3.91 + 125 95 88

TABLE 8 Herbicidal action of compound 1a.29, compound IIb and atrazine (post-emergence treatment; greenhouse) Application Brachiaria Colby Abutilon Colby rate plantaginea Value theophrasti Value [g/ha ai] Damage [%] E Damage [%] E Ia.29 + 7.81 + 85 80 IIb 250 atrazine 125 25 30 Ia.29 + 7.81 + 100 89 98 86 IIb + 250 + atrazine 125

TABLE 9 Herbicidal action of compound 1a.29, compound IIb and atrazine (post-emergence treatment; greenhouse) Application Galium rate aparine Colby [g/ha ai] Damage [%] Value E Ia.29 + IIb 7.81 + 250 80 atrazine 125 60 Ia.29 + IIb + atrazine 7.81 + 250 + 125 100 92

TABLE 10 Herbicidal action of compound 1a.29, compound IIb and atrazine (post-emergence treatment; greenhouse) Application Polygonum rate persicaria Colby [g/ha ai] Damage [%] Value E Ia.29 + IIb 3.91 + 125 30 atrazine 62.5 40 Ia.29 + IIb + atrazine 3.91 + 125 + 62.5 98 58

TABLE 11 Herbicidal action of compound 1a.29, compound IIb and atrazine (post-emergence treatment; greenhouse) Application Setaria Colby Pharbitis Colby rate faberi Value purpurea Value [g/ha ai] Damage [%] E Damage [%] E Ia.29 + 1.95 + 85 70 IIb 62.5 atrazine 31.2 30 60 Ia.29 + 1.95 + 98 90 100 88 IIb + 62.5 + atrazine 31.2

TABLE 12 Herbicidal action of compound 1a.29, compound IIb and atrazine (post-emergence treatment; greenhouse) Application Polygonum rate persicaria Colby [g/ha ai] Damage [%] Value E Ia.29 + Iib 1.95 + 62.5 75 atrazine 31.2 30 Ia.29 + IIb + atrazine 1.95 + 62.5 + 31.2 95 83 

1. A synergistic herbicidal mixture comprising A) at least one 3-heterocyclyl-substituted benzoyl derivative of the formula I

in which the variables have the following meanings: R¹, R³ are halogen, C₁-C₆-alkyl, C₁-C₆-haloalkyl, C₁-C₆-alkoxy, C₁-C₆-haloalkoxy, C₁-C₆-alkylthio, C₁-C₆-alkylsulfinyl or C₁-C₆-alkylsulfonyl; R² is a heterocyclic radical selected from the group: isoxazol-3-yl, isoxazol-4-yl, isoxazol-5-yl, 4,5-dihydroisoxazol-3-yl, 4,5-dihydroisoxazol-4-yl and 4,5-dihydroisoxazol-5-yl, it being possible for the six radicals mentioned to be unsubstituted or mono- or polysubstituted by halogen, C₁-C₄-alkyl, C₁-C₄-alkoxy, C₁-C₄-haloalkyl, C₁-C₄-haloalkoxy or C₁-C₄-alkylthio; R⁴ is hydrogen, halogen or C₁-C₆-alkyl; R⁵ is C₁-C₆-alkyl; R⁶ is hydrogen or C₁-C₆-alkyl; or one of its environmentally compatible salts; and B) at least the compound of formula IIa

or one of its environmentally compatible salts; or the compound of formula IIb

or one of its environmentally compatible salts; and, if desired, C) at least one herbicidal compound from the group of the acetyl-CoA carboxylase inhibitors (ACC), acetolactate synthase inhibitors (ALS), amides, auxin herbicides, auxin transport inhibitors, carotenoid biosynthesis inhibitors, enolpyruvylshikimate 3-phosphate synthase inhibitors (EPSPS), glutamine synthetase inhibitors, lipid biosynthesis inhibitors, mitosis inhibitors, protoporphyrinogen IX oxidase inhibitors, photosynthesis inhibitors, synergists, growth substances, cell wall biosynthesis inhibitors and a variety of other herbicides; in a synergistically effective amount.
 2. A synergistic herbicidal mixture as claimed in claim 1, comprising, as component A), a 3-heterocyclyl-substituted benzoyl derivative of the formula I, where R⁴ is hydrogen.
 3. A synergistic herbicidal mixture as claimed in claim 1, comprising, as component A), a 3-heterocyclyl-substituted benzoyl derivative of the formula I, where R¹ is halogen, C₁-C₆-alkyl or C₁-C₆-alkylsulfonyl; R³ is halogen or C₁-C₆-alkylsulfonyl;
 4. A synergistic herbicidal mixture as claimed in claim 1, comprising, as component A), a 3-heterocyclyl-substituted benzoyl derivative of the formula I, where R² is a heterocyclic radical selected from the group: isoxazol-3-yl, isoxazol-5-yl and 4,5-dihydroisoxazol-3-yl, it being possible for the three radicals mentioned to be unsubstituted or mono- or polysubstituted by halogen, C₁-C₄-alkyl, C₁-C₄-alkoxy, C₁-C₄-haloalkyl, C₁-C₄-haloalkoxy or C₁-C₄-alkylthio.
 5. A synergistic herbicidal mixture as claimed in claim 4, comprising, as component A), a 3-heterocyclyl-substituted benzoyl derivative of the formula I, where R² is isoxazol-5-yl, 3-methyl-isoxazol-5-yl, 4,5-dihydroisoxazol-3-yl, 5-methyl-4,5-dihydroisoxazol-3-yl, 5-ethyl-4,5-dihydroisoxazol-3-yl or 4,5-dimethyl-4,5-dihydroisoxazol-3-yl.
 6. A synergistic herbicidal mixture as claimed in claim 5, comprising, as component A), 4-[2-chloro-3-(4,5-di-hydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole.
 7. A synergistic herbicidal mixture as claimed in claim 5, comprising, as component A) 4-[2-methyl-3-(4,5-di-hydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole.
 8. A synergistic herbicidal mixture as claimed in claim 1, comprising, two active ingredients, a 3hetero-cyclyl-substituted benzoyl derivative of the formula I (component A) as claimed in claim 1 and the compound of formula IIa (component B).
 9. A synergistic herbicidal mixture as claimed in claim 8, comprising as component A) 4-[2-methyl-3-(4,5-dihydroisoxa-zol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole and as component B) the compound of formula Ia.
 10. A synergistic herbicidal mixture as claimed claim 1, comprising, three active ingredients, a 3-hetero-cyclyl-substituted benzoyl derivative of the formula I (component A) as claimed in claim 1 and as component B the compound of formula IIa and the compound of formula IIb.
 11. A synergistic herbicidal mixture as claimed in claim 10, comprising as component A) 4-[2-methyl-3-(4,5-dihydroisoxa-zol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole and as component B) the compound of formula IIa and the compound of formula IIb.
 12. A synergistic herbicidal mixture as claimed in claim 1, comprising, two active ingredients, a 3-hetero-cyclyl-substituted benzoyl derivative of the formula I (component A) as claimed in claim 1 and as component B the compound of formula IIb.
 13. A synergistic herbicidal mixture as claimed in claim 12, comprising as component A) 4-[2-methyl-3-(4,5-dihydroisoxa-zol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole and as component B) the compound of formula IIb.
 14. A synergistic herbicidal mixture as claimed in claim 1, comprising, at least, as component A) a 3-hetero-cyclyl-substituted benzoyl derivative of the formula I as claimed in claim 1; as component B) at least the compound of formula IIa or the compound of formula IIb; and as component C) at least one herbicidal compound from the group of the acetyl-CoA carboxylase inhibitors (ACC), acetolactate synthase inhibitors (ALS), amides, auxin herbicides, auxin transport inhibitors, carotenoid biosynthesis inhibitors, enolpyruvylshikimate 3-phosphate synthase inhibitors (EPSPS), glutamine synthetase inhibitors, lipid biosynthesis inhibitors, mitosis inhibitors, protoporphyrinogen IX oxidase inhibitors, photosynthesis inhibitors, synergists, growth substances, cell wall biosynthesis inhibitors and a variety of other herbicides.
 15. A synergistic herbicidal mixture as claimed in claim 1 comprising, as component C), at least one herbicidal compound from the groups C1 to C16: C1 acetyl-CoA carboxylase inhibitors (ACC): cyclohexenone oxime ethers, phenoxyphenoxypropionic esters or arylaminopropionic acids; C2 acetolactate synthase inhibitors (ALS): imidazolinones, pyrimidyl ethers, sulfonamides or sulfonylureas; C3 amides; C4 auxin herbicides: pyridinecarboxylic acids, 2,4-D or benazolin; C5 auxin transport inhibitors; C6 carotenoid biosynthesis inhibitors; C7 enolpyruvylshikimate 3-phosphate synthase inhibitors (EPSPS); C8 glutamine synthetase inhibitors; C9 lipid biosynthesis inhibitors: anilides, chloroacetanilides, thioureas, benfuresate or perfluidone; C10 mitosis inhibitors: carbamates, dinitroanilines, pyridines, butamifos, chlorthal-dimethyl (DCPA) or maleic hydrazide; C11 protoporphyrinogen IX oxidase inhibitors: diphenyl ethers, oxadiazoles, cyclic imides or pyrazoles; C12 photosynthesis inhibitors: propanil, pyridate, pyridafol, benzothiadiazinones, dinitrophenols, dipyridylenes, ureas, phenols, chloridazon, triazines, triazinones, uracils or biscarbamates; C13 synergists: oxiranes; C14 growth substances: aryloxyalkanoic acids, benzoic acids or quinolinecarboxylic acids; C15 cell wall synthesis inhibitors: C16 various other herbicides: dichloropropionic acids, dihydrobenzofurans, phenylacetic acids or aziprotryn, barban, bensulide, benzthiazuron, benzofluor, buminafos, buthidazole, buturon, cafenstrole, chlorbufam, chlorofenprop-methyl, chloroxuron, cinmethylin, cumyluron, cycluron, cyprazine, cyprazole, dibenzyluron, dipropetryn, dymron, eglinazin-ethyl, endothall, ethiozin, flucabazone, fluorbentranil, flupoxam, isocarbamid, isopropalin, karbutilate, mefluidide, monuron, napropamide, napropanilide, nitralin, oxaciclomefone, phenisopham, piperophos, procyazine, profluralin, pyributicarb, secbumeton, sulfallate (CDEC), terbucarb, triazofenamide, triaziflam or trimeturon; or their environmentally compatible salts.
 16. A synergistic herbicidal mixture as claimed in claim 1, comprising, as component C), at least one herbicidal compound from the groups C1 to C16: C1 acetyl-CoA carboxylase inhibitors (ACC): cyclohexenone oxime ethers: alloxydim, clethodim, cloproxydim, cycloxydim, sethoxydim, tralkoxydim, butroxydim, clefoxydim or tepraloxydim; phenoxyphenoxypropionic esters: clodinafop-propargyl (and, if appropriate, cloquintocet), cyhalofop-butyl, diclofop-methyl, fenoxaprop-ethyl, fenoxaprop-P-ethyl, fenthiapropethyl, fluazifop-butyl, fluazifop-P-butyl, haloxyfop-ethoxyethyl, haloxyfop-methyl, haloxyfop-P-methyl, isoxapyrifop, propaquizafop, quizalofop-ethyl, quizalofop-P-ethyl or quizalofop-tefuryl; or arylaminopropionic acids: flamprop-methyl or flamprop-isopropyl; C2 acetolactate synthase inhibitors (ALS): imidazolinones: imazapyr, imazaquin, imazamethabenz-methyl (imazame), imazamox, imazapic, imazethapyr or imazamethapyr; pyrimidyl ethers: pyrithiobac-acid, pyrithiobac-sodium, bispyribac-sodium, KIH-6127 or pyribenzoxym; sulfonamides: florasulam, flumetsulam or metosulam; or sulfonylureas: amidosulfuron, azimsulfuron, bensulfuron-methyl, chlorimuron-ethyl, chlorsulfuron, cinosulfuron, cyclosulfamuron, ethametsulfuron-methyl, ethoxysulfuron, flazasulfuron, halosulfuron-methyl, imazosulfuron, metsulfuron-methyl, nicosulfuron, primisulfuron-methyl, prosulfuron, pyrazosulfuron-ethyl, rimsulfuron, sulfometuron-methyl, thifensulfuron-methyl, triasulfuron, tribenuron-methyl, triflusulfuron-methyl, N-[[[4-methoxy-6-(tri-fluoromethyl)-1,3,5-triazin-2-yl]amino]-carbonyl]-2-(trifluoromethyl)-benzenesulfonamide, sulfosulfuron or iodosulfuron; C3 amides: allidochlor (CDAA), benzoylprop-ethyl, bromobutide, chlorthiamid, diphenamid, etobenzanid (benzchlomet), fluthiamide, fosamin or monalide; C4 auxin herbicides: pyridine carboxylic acids: clopyralid or picloram; or 2,4-D or benazolin; C5 auxin transport inhibitors: naptalame or diflufenzopyr; C6 carotenoid biosynthesis inhibitors: benzofenap, clomazone (dimethazone), diflufenican, fluorochloridone, fluridone, pyrazolynate, pyrazoxyfen, isoxaflutole, isoxachlortole, mesotrione, sulcotrione (chlormesulone), ketospiradox, flurtamone, norflurazon or amitrol; C7 enolpyruvylshikimate-3-phosphate synthase inhibitors (EPSPS): glyphosate or sulfosate; C8 glutamine synthetase inhibitors: bilanafos (bialaphos) or glufosinate-ammonium; C9 lipid biosynthesis inhibitors: anilides: anilofos or mefenacet; chloroacetanilides: dimethenamid, S-dimethenamid, acetochlor, alachlor, butachlor, butenachlor, diethatyl-ethyl, dimethachlor, metazachlor, metolachlor, S-metolachlor, pretilachlor, propachlor, prynachlor, terbuchlor, thenylchlor or xylachlor; thioureas: butylate, cycloate, di-allate, dimepiperate, EPTC, esprocarb, molinate, pebulate, prosulfocarb, thiobencarb (benthiocarb), triallate or vernolate; or benfuresate or perfluidone; C10 mitosis inhibitors: carbamates: asulam, carbetamid, chlorpropham, orbencarb, pronamid (propyzamid), propham or tiocarbazil; dinitroanilines: benefin, butralin, dinitramin, ethalfluralin, fluchloralin, oryzalin, pendimethalin, prodiamine or trifluralin; pyridines: dithiopyr or thiazopyr; or butamifos, chlorthal-dimethyl (DCPA) or maleic hydrazide; C11 protoporphyrinogen IX oxidase inhibitors: diphenyl ethers: acifluorfen, acifluorfen-sodium, aclonifen, bifenox, chlornitrofen (CNP), ethoxyfen, fluorodifen, fluoroglycofen-ethyl, fomesafen, furyloxyfen, lactofen, nitrofen, nitrofluorfen or oxyfluorfen; oxadiazoles: oxadiargyl or oxadiazon; cyclic imides: azafenidin, butafenacil, carfentrazone-ethyl, cinidon-ethyl, flumiclorac-pentyl, flumioxazin, flumipropyn, flupropacil, fluthiacet-methyl, sulfentrazone or thidiazimin; or pyrazoles: ET-751, JV 485 or nipyraclofen; C12 photosynthesis inhibitors: propanil, pyridate or pyridafol; benzothiadiazinones: bentazone; dinitrophenols: bromofenoxim, dinoseb, dinoseb-acetate, dinoterb or DNOC; dipyridylenes: cyperquat-chloride, difenzoquat-methylsulfate, diquat or paraquat-dichloride; ureas: chlorbromuron, chlorotoluron, difenoxuron, dimefuron, diuron, ethidimuron, fenuron, fluometuron, isoproturon, isouron, linuron, methabenzthiazuron, methazole, metobenzuron, metoxuron, monolinuron, neburon, siduron or tebuthiuron; phenols: bromoxynil or ioxynil; chloridazon; triazines: ametryn, atrazine, cyanazine, desmetryn, dimethamethryn, hexazinone, prometon, prometryn, propazine, simazine, simetryn, terbumeton, terbutryn, terbutylazine or trietazine; triazinones: metamitron or metribuzine; uracils: bromacil, lenacil or terbacil; or biscarbamates: desmedipham or phenmedipham; C13 synergists: oxiranes: tridiphane; C14 growth substances: aryloxyalkanoic acids: 2,4-DB, clomeprop, dichlorprop, dichlorprop-P (2,4-DP-P), fluoroxypyr, MCPA, MCPB, mecoprop, mecoprop-P, or triclopyr; benzoic acids: chloramben or dicamba; or quinolinecarboxylic acids: quinclorac or quinmerac; C15 cell wall synthesis inhibitors: isoxaben or dichlobenil; C16 various other herbicides: dichloropropionic acids: dalapon; dihydrobenzofurans: ethofumesate; phenylacetic acids: chlorfenac (fenac); or aziprotryn, barban, bensulide, benzthiazuron, benzofluor, buminafos, buthidazole, buturon, cafenstrole, chlorbufam, chlorfenprop-methyl, chloroxuron, cinmethylin, cumyluron, cycluron, cyprazine, cyprazole, dibenzyluron, dipropetryn, dymron, eglinazin-ethyl, endothall, ethiozin, flucabazone, fluorbentranil, flupoxam, isocarbamid, isopropalin, karbutilate, mefluidide, monuron, napropamide, napropanilide, nitralin, oxaciclomefone, phenisopham, piperophos, procyazine, profluralin, pyributicarb, secbumeton, sulfallate (CDEC), terbucarb, triazofenamid, triaziflan or trimeturon; or their environmentally compatible salts.
 17. A synergistic herbicidal mixture as claimed in 15, comprising, as component C), at least one herbicidal compound from the groups C5, C9 or C
 12. 18. A synergistic herbicidal mixture as claimed in 17, comprising, as component C), at least one herbicidal compound from the groups C9 or C
 12. 19. A synergistic herbicidal mixture as claimed in claim 15 comprising, as component A) 4-[2-methyl-3-(4,5-dihydroisoxa-zol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B) at least the compound of formula IIa or the compound of formula IIb, and as component C) a herbicidal compound from the group C5.
 20. A synergistic herbicidal mixture as claimed in claim 15 comprising, as component A) 4-[2-methyl-3-(4,5-dihydroisoxa-zol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B) at least the compound of formula IIa or the compound of formula IIb, and as component C) diflufenzopyr.
 21. A synergistic herbicidal mixture as claimed in claim 15 comprising, as component A) 4-[2-methyl-3-(4,5-dihydroisoxa-zol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B) at least the compound of formula IIa or the compound of formula IIb, and as component C) a herbicidal compound from the group C9.
 22. A synergistic herbicidal mixture as claimed in claim 15 comprising, as component A) 4-[2-methyl-3-(4,5-dihydroisoxa-zol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B) at least the compound of formula IIa or the compound of formula IIb, and as component C) an a chloroacetanilide.
 23. A synergistic herbicidal mixture as claimed in claim 15 comprising, as component A) 4-[2-methyl-3-(4,5-dihydroisoxa-zol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B) at least the compound of formula IIa or the compound of formula IIb, and as component C) acetochlor.
 24. A synergistic herbicidal mixture as claimed in claim 15 comprising, as component A) 4-[2-methyl-3-(4,5-dihydroisoxa-zol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B) at least the compound of formula IIa or the compound of formula IIb, and as component C) a herbicidal compound from the group C12.
 25. A synergistic herbicidal mixture as claimed in claim 15 comprising, as component A) 4-[2-methyl-3-(4,5-dihydroisoxa-zol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B) at least the compound of formula IIa or the compound of formula IIb, and as component C) a triazine from group C12.
 26. A synergistic herbicidal mixture as claimed in claim 15, comprising as component A) 4-[2-methyl-3-(4,5-dihydroisoxa-zol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B) at least the compound of formula IIa or the compound of formula IIb, and as component C) atrazine.
 27. A synergistic herbicidal mixture as claimed in claim 15 comprising, as component A) 4-[2-methyl-3-(4,5-dihydroisoxa-zol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B) at least the compound of formula IIa or the compound of formula IIb, and as component C) a herbicidal compound from the group C5 and a herbicidal compound from the group C12.
 28. A synergistic herbicidal mixture as claimed in claim 15 comprising, as component A) 4-[2-methyl-3-(4,5-dihydroisoxa-zol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B) at least the compound of formula IIa or the compound of formula IIb, and as component C) an auxin transport inhibitor and a triazine.
 29. A synergistic herbicidal mixture as claimed in claim 15 comprising, as component A) 4-[2-methyl-3-(4,5-dihydroisoxa-zol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B) at least the compound of formula IIa or the compound of formula IIb, and as component C) andiflufenzopyr and atrazine.
 30. Synergistic herbicidal mixture as claimed in claim 1, wherein component A) and B) are present in a weight ratio of 1:0.001 to 1:500.
 31. Synergistic herbicidal mixture as claimed in claim 14, wherein component A) and component C) are present in a weight ratio of 1:0.002 to 1:800.
 32. A herbicidal composition comprising a herbicidally active amount of a synergistic herbicidal mixture as claimed in claim 1, at least one inert liquid and/or solid carrier and, if desired, at least one surfactant.
 33. A process for the preparation of herbicidal compositions as claimed in claim 32, comprising mixing component A), component B), if desired, component C), at least one inert liquid and/or solid carrier and, if appropriate, a surfactant.
 34. A method of controlling undesired vegetation, which comprising applying simultaneously or separately to said vegetation, the environment of said vegetation and/or seeds of said vegetation. A) at least one 3-heterocyclyl-substituted benzoyl derivative of the formula I

in which the variables have the following meanings: R¹, R³ are halogen, C₁-C₆-alkyl, C₁-C₆-haloalkyl, C₁-C₆-alkoxy, C₁-C₆-haloalkoxy, C₁-C₆-alkylthio, C₁-C₆-alkylsulfinyl or C₁-C₆-alkylsulfonyl; R² is a heterocyclic radical selected from the group: isoxazol-3-yl, isoxazol-4-yl, isoxazol-5-yl, 4,5-dihydroisoxazol-3-yl, 4,5-dihydroisoxazol-4-yl and 4,5-dihydroisoxazol-5-yl, it being possible for the six radicals mentioned to be unsubstituted or mono- or polysubstituted by halogen, C₁-C₄-alkyl, C₁-C₄-alkoxy, C₁-C₄-haloalkyl, C₁-C₄-haloalkoxy or C₁-C₄-alkylthio, R⁴ is hydrogen, halogen or C₁-C₆-alkyl; R⁵ is C₁-C₆-alkyl; R⁶ is hydrogen or C₁-C₆-alkyl; or one of its environmentally compatible salts; and B) at least the compound of formula IIa

or one of its environmentally compatible salts; or the compound of formula IIb

or one of its environmentally compatible salts; and, if desired, C) at least one herbicidal compound from the group of the acetyl-CoA carboxylase inhibitors (ACC), acetolactate synthase inhibitors (ALS), amides, auxin herbicides, auxin transport inhibitors, carotenoid biosynthesis inhibitors, enolpyruvylshikimate 3-Phosphate synthase inhibitors (EPSPS), glutamine synthetase inhibitors, lipid biosynthesis inhibitors, mitosis inhibitors, protoporphyrinogen IX oxidase inhibitors, Photosynthesis inhibitors, synergists, growth substances, cell wall biosynthesis inhibitors and a variety of other herbicides; in a synergistically effective amount.
 35. The method of claim 34, wherein the undesired vegetation is proximate crop plants, and the application is to the leaves of the crop plant and of the undesired vegetation. 